KVM: nVMX: Use cached exit reason

No need to re-read what vmx_vcpu_run already picked up for us.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3a58c1b..f7d2242 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6082,10 +6082,10 @@ static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
  */
 static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
 {
-       u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
        u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
        struct vcpu_vmx *vmx = to_vmx(vcpu);
        struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
+       u32 exit_reason = vmx->exit_reason;
 
        if (vmx->nested.nested_run_pending)
                return 0;
@@ -7399,7 +7399,7 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 
        /* update exit information fields: */
 
-       vmcs12->vm_exit_reason  = vmcs_read32(VM_EXIT_REASON);
+       vmcs12->vm_exit_reason  = to_vmx(vcpu)->exit_reason;
        vmcs12->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 
        vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);